Patents by Inventor Tokuichi Saeki

Tokuichi Saeki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for synthesizing 4-halo-5-(hydroxymethyl) imidazole compounds
    Patent number: 5514811
    Abstract: A process for preparing, on an industrial scale, 4-halo-5-(hydroxymethyl) imidazole compounds that are useful as intermediates for medicines. A 4-chloro-5-(hydroxymethyl) imidazole compound, a 4-bromo-5-(hydroxymethyl) imidazole compound or a like compound is synthesized by reacting a 4,5-bis(hydroxymethyl) imidazole compound with a halogenating agent such as an N-chlorosuccinimide, an N-bromosuccinimide, a chlorinated isocyanuric acid compound or the like compound.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: May 7, 1996
    Assignee: Shikoku Chemicals Corporation
    Inventors: Takayuki Murai, Tokuichi Saeki, Suzuko Satou, Shozo Miura, Tomoko Takashige, Naoki Kano
  • Method for preventing rusting in silver by using novel imidazole-4(5)-dithiocarboxylic acids in organic solvent
    Patent number: 4469622
    Abstract: Disclosed is an imidazole-4(5)-dithiocarboxylic acid compound represented by the following general formula: ##STR1## wherein R.sub.2 stands for a hydrogen atom or a monovalent hydrocarbon group having up to 20 carbons, R.sub.4 stands for a hydrogen atom or an alkyl group having up to 4 carbon atoms, and X stands for a hydrogen atom or an alkali metal atom.This compound has an excellent rust preventive action to silver. This compound is prepared according to a process which comprises reacting an imidazole compound represented by the following general formula: ##STR2## wherein R.sub.2 and R.sub.4 are as defined above, with carbon disulfides and an alkali metal hydroxide in the presence of a solvent, and if necessary, acidifying the obtained imidazole compound.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: September 4, 1984
    Assignee: Shikoku Chemicals Corporation
    Inventors: Natsuo Sawa, Tokuichi Saeki
  • Process of preparing imidazole 4(5) dithiocarboxylic acid
    Patent number: 4431818
    Abstract: Disclosed is an imidazole-4(5)-dithiocarboxylic acid compound represented by the following general formula: ##STR1## wherein R.sub.2 stands for a hydrogen atom or a monovalent hydrocarbon group having up to 20 carbons, R.sub.4 stands for a hydrogen atom or an alkyl group having up to 4 carbon atoms, and X stands for a hydrogen atom or an alkali metal atom.This compound has an excellent rust preventive action to silver. This compound is prepared according to a process which comprises reacting an imidazole compound represented by the following general formula: ##STR2## wherein R.sub.2 and R.sub.4 are as defined above, with carbon disulfide and an alkali metal hydroxide in the presence of a solvent, and if necessary, acidifying the obtained imidazole compound.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: February 14, 1984
    Assignee: Shikoku Chemical Corporation
    Inventors: Natsuo Sawa, Tokuichi Saeki
  • Imidazole 4(5)-dithiocarboxylic acids or salts
    Patent number: 4394511
    Abstract: Disclosed is an imidazole-4(5)-dithiocarboxylic acid compound represented by the following general formula: ##STR1## wherein R.sub.2 stands for a hydrogen atom or a monovalent hydrocarbon group having up to 20 carbons, R.sub.4 stands for a hydrogen atom or an alkyl group having up to 4 carbon atoms, and X stands for a hydrogen atom or an alkali metal atom.This compound has an excellent rust preventive action to silver. This compound is prepared according to a process which comprises reacting an imidazole compound represented by the following general formula: ##STR2## wherein R.sub.2 and R.sub.4 are as defined above, with carbon disulfide and an alkali metal hydroxide in the presence of a solvent, and if necessary, acidifying the obtained imidazole compound.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: July 19, 1983
    Assignee: Shikoku Chemicals Corporation
    Inventors: Natsuo Sawa, Tokuichi Saeki